2179409 has 4 divisors (see below), whose sum is σ = 2183220. Its totient is φ = 2175600.

The previous prime is 2179399. The next prime is 2179459. The reversal of 2179409 is 9049712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1149184 + 1030225 = 1072^2 + 1015^2 .

It is a cyclic number.

It is not a de Polignac number, because 2179409 - 2⁸ = 2179153 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2179459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 854 + ... + 2255.

It is an arithmetic number, because the mean of its divisors is an integer number (545805).

2^2179409 is an apocalyptic number.

It is an amenable number.

2179409 is a deficient number, since it is larger than the sum of its proper divisors (3811).

2179409 is an equidigital number, since it uses as much as digits as its factorization.

2179409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3810.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 2179409 is about 1476.2821546032. The cubic root of 2179409 is about 129.6521073110.

The spelling of 2179409 in words is "two million, one hundred seventy-nine thousand, four hundred nine".